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broken deadbolt

Why do you have to drill it out. The cylinder has to be removable, it certainly was not machined on the door . If there are screws visible on the cylinder, remove them and the two halves of the deadbolt will separate, allowing you to flip open the latch bolt with a screwdriver. If it has no visible screws, it is held in place by the interior trim ring screwing onto the body of the exterior half. Grip the ring with some channel lock type pliers and turn it counter clockwise . If it does not move readily, you may have to hold a sharp chisel against the ring and tap it so that it bites into the ring and rotates it. Sounds like you should be prepared to replace the deadbolt, as either of these will leave some scars on the trim ring.

broken deadbolt

There should be plugs covering the screws on the interior side of the door. Once the door is removed by pulling the hinge pins, you should be able to take off the Dead Bolt and install a new one.

Unhinging the door has no effect on being able to separate the two halves of the cylinder. I think there is a misconception that he will be able to remove the "bolt" from the edge of the door, and somehow this will allow the cylinders to separate, but it is not so. The inner and outer cylinders are secured to each other, either by screws or by the two halves threading together.

broken deadbolt

If you look at the key, you - or someone at the local HD or hardware store - should be able to tell if it's a Kwikset, Segal, Schlage, Weisner, Titan, etc. Each key has a distinct shape to its head and Kwikset and Segal are by far the most common ones used in residences over the years. Schlage is more common to commercial.